White-faced Whistling-ducks are noted for their peculiar discontinuous geotropical and African distribution, but despite the wide transatlantic separation, the two populations are not racially distinct. They are basically crepuscular or nocturnal, they forage during the day, especially in winter. Less inclined to perch in trees than some of their relatives, they loaf much of their day in large numbers on mudflats or sandbars. They live a diversity of aquatic and terrestrial habitats from sea level to at least 8,500 feet in the eastern Andes. White-Faced Whistling-ducks prefer open-country wetlands, and normally avoid wooded or forested regions. They generally breed during the rainy season. Substantial nests are well concealed in long grass or among reedbeds, but pairs also seek tree hollows and occasionally even forks in low waterside trees. While nests can be located some distance from water, breeding on marshy ground is more typical and nests over water may be partially concealed by surrounding vegetation that is pulled down. Mating normally occurs in the water, but pairs sometimes also copulate while standing in shallow water. The parents are protective and tend to conceal progeny in thick cover until about eight weeks of age. Threatened ducklings are apt to dive while their parents flap noisily over the water feigning broken wings to draw intruders away.